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15 results on '"Tyuterev, V. G."'

3. First-principle Calculations of Electron-Phonon Interactions in $A^{II}B^{IV}C^{V}_2$ Crystals

Author

Tyuterev, V. G.

Subjects
Condensed Matter - Materials Science
Abstract

$Ab-initio$ probabilities of phonon-assisted intervalley scattering of electrons in the conduction bands of ternary chalcopyrite compounds $ZnSiP_2$ and $ZnGeP_2$ between the central $\Gamma$ minima and the lowest lateral minima (valleys) at $T$ and $N$ points have been calculated using the density functional theory. The equilibrium parameters of crystal structures, spectra of electrons and phonons are calculated self-consistently and are in fairly good agreement with the experiment and available theoretical calculations. The electron-phonon coupling constants with short-wave (inter-valley) phonons in the chalcopyrite phosphides are close to their values in $Si$, $Ge$ and in binary analog $GaP$.

Published
2019

4. Electron-phonon relaxation and excited electron distribution in gallium nitride

Author

Zhukov, V. P., Tyuterev, V. G., Echenique, P. M., and Chulkov, E. V.

Subjects
Condensed Matter - Materials Science
Abstract

We develop a theory of energy relaxation in semiconductors and insulators highly excited by the long-acting external irradiation. We derive the equation for the non-equilibrium distribution function of excited electrons. The solution for this function breaks up into the sum of two contributions. The low-energy contribution is concentrated in a narrow range near the bottom of the conduction band. It has the typical form of a Fermi distribution with an effective temperature and chemical potential. The effective temperature and chemical potential in this low-energy term are determined by the intensity of carriers' generation, the speed of electron-phonon relaxation, rates of inter-band recombination and electron capture on the defects. In addition, there is a substantial high-energy correction. This high-energy 'tail' covers largely the conduction band. The shape of the high-energy 'tail' strongly depends on the rate of electron-phonon relaxation but does not depend on the rates of recombination and trapping. We apply the theory to the calculation of a non-equilibrium distribution of electrons in irradiated GaN. Probabilities of optical excitations from the valence to conduction band and electron-phonon coupling probabilities in GaN were calculated by the density functional perturbation theory. Our calculation of both parts of distribution function in gallium nitride shows that when the speed of electron-phonon scattering is comparable with the rate of recombination and trapping then the contribution of the non-Fermi 'tail' is comparable with that of the low-energy Fermi-like component. So the high-energy contribution can affect essentially the charge transport in the irradiated and highly doped semiconductors., Comment: 15 pages, 6 figures

Published
2015
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5. Experimental Study and Simulation of Singlet-Triplet Rovibronic Ozone Bands in the 11 900–12 800 cm−1 Region.

Author

Vasilchenko, S. S., Solodov, A. A., Egorov, O. V., and Tyuterev, V. G.

Abstract

A compact absorption spectrometer with a narrowband continuous tunable diode laser is created; it provides sensitivity on the order of 1 × 10−6 cm−1 in terms of the absorption coefficient. The design of the spectrometer, the measurement technique, and the ozone generation and control procedure are described. The absorption spectrum of the ozone molecule is recorded for a system of Wulf bands in the near-IR range 11 900–12 800 cm−1, which correspond to rovibronic transitions from the ground to excited triplet electronic states above the main dissociation threshold of the molecule. The absorption coefficient is simulated and predissociation broadening of spectral lines is estimated in the spectral range under study based on the simulation results. Ozone absorption cross sections in this range are recommended for atmospheric applications; they have been derived using statistically weighted averaging of the new measurements and published laboratory experimental data. [ABSTRACT FROM AUTHOR]

Published
2024
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6. Analysis of New Measurements of 18O-substituted Isotopic Species 16O16O18O and 16O18O16O of Ozone in the THz and Far-Infrared Ranges.

Author

Starikova, E. N., Barbe, A., Manceron, L., Grouiez, B., Burgalat, J., and Tyuterev, V. G.

Abstract

High-resolution spectra corresponding to the rotational and the ν2–ν2 bands of the two most abundant isotopic species of ozone with one heavy 18O oxygen atom were recorded using SOLEIL synchrotron radiation source in the range 30–200 cm−1. Additionally, the ν2 vibrational-rotational bands were recorded between 550 and 880 cm−1 using a classical glowbar source that made it possible to extend and refine information compared to published data on the observed transitions of these bands. The analyses of recorded spectra permitted us to deduce experimental set of energy levels for the ground (000) and the first bending (010) vibrational states, which significantly exceeds literature data in terms of rotational quantum numbers. For both isotopic species, the weighted fits of all experimental line positions were carried out including previously published microwave data. As a result of this work, the improved values of rotational and centrifugal distortion parameters for the states (000) and (010) were obtained that permitted modelling the experimental line positions with a weighted standard deviation of 1.284 (2235 transitions) and 0.908 (4597 transitions), respectively, for 16O16O18O, and 1.168 (824 transitions) and 1.724 (2381 transitions) for 16O18O16O. [ABSTRACT FROM AUTHOR]

Published
2024
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7. The HITRAN2020 molecular spectroscopic database

Author

Gordon, I. E., Rothman, L. S., Hargreaves, R. J., Hashemi, R., Karlovets, E., V, Skinner, F. M., Conway, E. K., Hill, C., Kochanov, R., V, Tan, Y., Wcislo, P., Finenko, A. A., Nelson, K., Bernath, P. F., Birk, M., Boudon, V, Campargue, A., Chance, K., V, Coustenis, A., Drouin, B. J., Flaud, J-M, Gamache, R. R., Hodges, J. T., Jacquemart, D., Mlawer, E. J., Nikitin, A., V, Perevalov, V., I, Rotger, M., Tennyson, J., Toon, G. C., Tran, H., Tyuterev, V. G., Adkins, E. M., Baker, A., Barbe, A., Cane, E., Csaszar, A. G., Dudaryonok, A., Egorov, O., Fleisher, A. J., Fleurbaey, H., Foltynowicz, A., Furtenbacher, T., Harrison, J. J., Hartmann, J-M, Horneman, V-M, Huang, X., Karman, T., Karns, J., Kassi, S., Kleiner, I, Kofman, V, Kwabia-Tchana, F., Lavrentieva, N. N., Lee, T. J., Long, D. A., Lukashevskaya, A. A., Lyulin, O. M., Makhnev, V. Yu, Matt, W., Massie, S. T., Melosso, M., Mikhailenko, S. N., Mondelain, D., Mueller, H. S. P., Naumenko, O., V, Perrin, A., Polyansky, O. L., Raddaoui, E., Raston, P. L., Reed, Z. D., Rey, M., Richard, C., Tobias, R., Sadiek, I, Schwenke, D. W., Starikova, E., Sung, K., Tamassia, F., Tashkun, S. A., Vander Auwera, J., Vasilenko, I. A., Vigasin, A. A., Villanueva, G. L., Vispoel, B., Wagner, G., Yachmenev, A., Yurchenko, S. N., Gordon, I. E., Rothman, L. S., Hargreaves, R. J., Hashemi, R., Karlovets, E., V, Skinner, F. M., Conway, E. K., Hill, C., Kochanov, R., V, Tan, Y., Wcislo, P., Finenko, A. A., Nelson, K., Bernath, P. F., Birk, M., Boudon, V, Campargue, A., Chance, K., V, Coustenis, A., Drouin, B. J., Flaud, J-M, Gamache, R. R., Hodges, J. T., Jacquemart, D., Mlawer, E. J., Nikitin, A., V, Perevalov, V., I, Rotger, M., Tennyson, J., Toon, G. C., Tran, H., Tyuterev, V. G., Adkins, E. M., Baker, A., Barbe, A., Cane, E., Csaszar, A. G., Dudaryonok, A., Egorov, O., Fleisher, A. J., Fleurbaey, H., Foltynowicz, A., Furtenbacher, T., Harrison, J. J., Hartmann, J-M, Horneman, V-M, Huang, X., Karman, T., Karns, J., Kassi, S., Kleiner, I, Kofman, V, Kwabia-Tchana, F., Lavrentieva, N. N., Lee, T. J., Long, D. A., Lukashevskaya, A. A., Lyulin, O. M., Makhnev, V. Yu, Matt, W., Massie, S. T., Melosso, M., Mikhailenko, S. N., Mondelain, D., Mueller, H. S. P., Naumenko, O., V, Perrin, A., Polyansky, O. L., Raddaoui, E., Raston, P. L., Reed, Z. D., Rey, M., Richard, C., Tobias, R., Sadiek, I, Schwenke, D. W., Starikova, E., Sung, K., Tamassia, F., Tashkun, S. A., Vander Auwera, J., Vasilenko, I. A., Vigasin, A. A., Villanueva, G. L., Vispoel, B., Wagner, G., Yachmenev, A., and Yurchenko, S. N.

Abstract

The HITRAN database is a compilation of molecular spectroscopic parameters. It was established in the early 1970s and is used by various computer codes to predict and simulate the transmission and emission of light in gaseous media (with an emphasis on terrestrial and planetary atmospheres). The HITRAN compilation is composed of five major components: the line-by-line spectroscopic parameters required for high-resolution radiative-transfer codes, experimental infrared absorption cross-sections (for molecules where it is not yet feasible for representation in a line-by-line form), collision-induced absorption data, aerosol indices of refraction, and general tables (including partition sums) that apply globally to the data. This paper describes the contents of the 2020 quadrennial edition of HITRAN. The HITRAN2020 edition takes advantage of recent experimental and theoretical data that were meticulously validated, in particular, against laboratory and atmospheric spectra. The new edition replaces the previous HITRAN edition of 2016 (including its updates during the intervening years). All five components of HITRAN have undergone major updates. In particular, the extent of the updates in the HITRAN2020 edition range from updating a few lines of specific molecules to complete replacements of the lists, and also the introduction of additional isotopologues and new (to HITRAN) molecules: SO, CH3F, GeH4, CS2, CH3I and NF3. Many new vibrational bands were added, extending the spectral coverage and completeness of the line lists. Also, the accuracy of the parameters for major atmospheric absorbers has been increased substantially, often featuring sub-percent uncertainties. Broadening parameters associated with the ambient pressure of water vapor were introduced to HITRAN for the first time and are now available for several molecules. The HITRAN2020 edition continues to take advantage of the relational structure and efficient interface available at www.hitran.org and the HITR

Published
2022

8. The HITRAN2020 molecular spectroscopic database

Author

Gordon, I. E. (I. E.), Rothman, L. S. (L. S.), Hargreaves, R. J. (R. J.), Hashemi, R. (R.), Karlovets, E. V. (E., V), Skinner, F. M. (F. M.), Conway, E. K. (E. K.), Hill, C. (C.), Kochanov, R. V. (R., V), Tan, Y. (Y.), Wcislo, P. (P.), Finenko, A. A. (A. A.), Nelson, K. (K.), Bernath, P. F. (P. F.), Birk, M. (M.), Boudon, V. (V), Campargue, A. (A.), Chance, K. V. (K., V), Coustenis, A. (A.), Drouin, B. J. (B. J.), Flaud, J.-M. (J-M), Gamache, R. R. (R. R.), Hodges, J. T. (J. T.), Jacquemart, D. (D.), Mlawer, E. J. (E. J.), Nikitin, A. V. (A., V), Perevalov, V. I. (V., I), Rotger, M. (M.), Tennyson, J. (J.), Toon, G. C. (G. C.), Tran, H. (H.), Tyuterev, V. G. (V. G.), Adkins, E. M. (E. M.), Baker, A. (A.), Barbe, A. (A.), Cane, E. (E.), Csaszar, A. G. (A. G.), Dudaryonok, A. (A.), Egorov, O. (O.), Fleisher, A. J. (A. J.), Fleurbaey, H. (H.), Foltynowicz, A. (A.), Furtenbacher, T. (T.), Harrison, J. J. (J. J.), Hartmann, J.-M. (J-M), Horneman, V.-M. (V-M), Huang, X. (X.), Karman, T. (T.), Karns, J. (J.), Kassi, S. (S.), Kleiner, I. (I), Kofman, V. (V), Kwabia-Tchana, F. (F.), Lavrentieva, N. N. (N. N.), Lee, T. J. (T. J.), Long, D. A. (D. A.), Lukashevskaya, A. A. (A. A.), Lyulin, O. M. (O. M.), Makhnev, V. Y. (V. Yu), Matt, W. (W.), Massie, S. T. (S. T.), Melosso, M. (M.), Mikhailenko, S. N. (S. N.), Mondelain, D. (D.), Mueller, H. S. (H. S. P.), Naumenko, O. V. (O., V), Perrin, A. (A.), Polyansky, O. L. (O. L.), Raddaoui, E. (E.), Raston, P. L. (P. L.), Reed, Z. D. (Z. D.), Rey, M. (M.), Richard, C. (C.), Tobias, R. (R.), Sadiek, I. (I), Schwenke, D. W. (D. W.), Starikova, E. (E.), Sung, K. (K.), Tamassia, F. (F.), Tashkun, S. A. (S. A.), Vander Auwera, J. (J.), Vasilenko, I. A. (I. A.), Vigasin, A. A. (A. A.), Villanueva, G. L. (G. L.), Vispoel, B. (B.), Wagner, G. (G.), Yachmenev, A. (A.), Yurchenko, S. N. (S. N.), Gordon, I. E. (I. E.), Rothman, L. S. (L. S.), Hargreaves, R. J. (R. J.), Hashemi, R. (R.), Karlovets, E. V. (E., V), Skinner, F. M. (F. M.), Conway, E. K. (E. K.), Hill, C. (C.), Kochanov, R. V. (R., V), Tan, Y. (Y.), Wcislo, P. (P.), Finenko, A. A. (A. A.), Nelson, K. (K.), Bernath, P. F. (P. F.), Birk, M. (M.), Boudon, V. (V), Campargue, A. (A.), Chance, K. V. (K., V), Coustenis, A. (A.), Drouin, B. J. (B. J.), Flaud, J.-M. (J-M), Gamache, R. R. (R. R.), Hodges, J. T. (J. T.), Jacquemart, D. (D.), Mlawer, E. J. (E. J.), Nikitin, A. V. (A., V), Perevalov, V. I. (V., I), Rotger, M. (M.), Tennyson, J. (J.), Toon, G. C. (G. C.), Tran, H. (H.), Tyuterev, V. G. (V. G.), Adkins, E. M. (E. M.), Baker, A. (A.), Barbe, A. (A.), Cane, E. (E.), Csaszar, A. G. (A. G.), Dudaryonok, A. (A.), Egorov, O. (O.), Fleisher, A. J. (A. J.), Fleurbaey, H. (H.), Foltynowicz, A. (A.), Furtenbacher, T. (T.), Harrison, J. J. (J. J.), Hartmann, J.-M. (J-M), Horneman, V.-M. (V-M), Huang, X. (X.), Karman, T. (T.), Karns, J. (J.), Kassi, S. (S.), Kleiner, I. (I), Kofman, V. (V), Kwabia-Tchana, F. (F.), Lavrentieva, N. N. (N. N.), Lee, T. J. (T. J.), Long, D. A. (D. A.), Lukashevskaya, A. A. (A. A.), Lyulin, O. M. (O. M.), Makhnev, V. Y. (V. Yu), Matt, W. (W.), Massie, S. T. (S. T.), Melosso, M. (M.), Mikhailenko, S. N. (S. N.), Mondelain, D. (D.), Mueller, H. S. (H. S. P.), Naumenko, O. V. (O., V), Perrin, A. (A.), Polyansky, O. L. (O. L.), Raddaoui, E. (E.), Raston, P. L. (P. L.), Reed, Z. D. (Z. D.), Rey, M. (M.), Richard, C. (C.), Tobias, R. (R.), Sadiek, I. (I), Schwenke, D. W. (D. W.), Starikova, E. (E.), Sung, K. (K.), Tamassia, F. (F.), Tashkun, S. A. (S. A.), Vander Auwera, J. (J.), Vasilenko, I. A. (I. A.), Vigasin, A. A. (A. A.), Villanueva, G. L. (G. L.), Vispoel, B. (B.), Wagner, G. (G.), Yachmenev, A. (A.), and Yurchenko, S. N. (S. N.)

Abstract

The HITRAN database is a compilation of molecular spectroscopic parameters. It was established in the early 1970s and is used by various computer codes to predict and simulate the transmission and emission of light in gaseous media (with an emphasis on terrestrial and planetary atmospheres). The HITRAN compilation is composed of five major components: the line-by-line spectroscopic parameters required for high-resolution radiative-transfer codes, experimental infrared absorption cross-sections (for molecules where it is not yet feasible for representation in a line-by-line form), collision-induced absorption data, aerosol indices of refraction, and general tables (including partition sums) that apply globally to the data. This paper describes the contents of the 2020 quadrennial edition of HITRAN. The HITRAN2020 edition takes advantage of recent experimental and theoretical data that were meticulously validated, in particular, against laboratory and atmospheric spectra. The new edition replaces the previous HITRAN edition of 2016 (including its updates during the intervening years). All five components of HITRAN have undergone major updates. In particular, the extent of the updates in the HITRAN2020 edition range from updating a few lines of specific molecules to complete replacements of the lists, and also the introduction of additional isotopologues and new (to HITRAN) molecules: SO, CH₃F, GeH₄, CS₂, CH₃I and NF₃. Many new vibrational bands were added, extending the spectral coverage and completeness of the line lists. Also, the accuracy of the parameters for major atmospheric absorbers has been increased substantially, often featuring sub-percent uncertainties. Broadening parameters associated with the ambient pressure of water vapor were introduced to HITRAN for the first time and are now available for several molecules. The HITRAN2020 edition continues to take advantage of the relational structure and efficient interface available at www.hitran.org and

Published
2022

9. Experiment on Recording Ozone Absorption Transitions to 3A2 Triplet Electronic State by High-Sensitivity Cavity Ring-Down Spectroscopy in the Range 9350–10 000 cm−1.

Author

Vasilchenko, S. S., Egorov, O. V., and Tyuterev, V. G.

Abstract

The results of the highly sensitive recording of the absorption spectrum for the Wulf band series in the near-infrared range 9350–10 000 cm–1, corresponding to the transitions from the ground to an excited triplet electronic state of the ozone molecule, are discussed. For the first time, the ozone spectrum in the range above the main molecular dissociation threshold was recorded using a continuous wave cavity ring-down spectrometer (cw-CRDS). The spectrometer provided sensitivity on the order of 1 × 10–10 cm–1 for the absorption coefficient. The measurement technique, ozone generation, and control of its concentration are described. A comparison with previously calculated theoretical spectra of the singlet-triplet bands 3A2(000) ← X 1A1(000), 3A2(010) ← X 1A1(000), and 3A2(010) ← X 1A1(010) is carried out. [ABSTRACT FROM AUTHOR]

Published
2023
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10. Electron-phonon relaxation and excited electron distribution in gallium nitride.

Author

Zhukov, V. P., Tyuterev, V. G., Chulkov, E. V., and Echenique, P. M.

Subjects
*ELECTRON-phonon interactions, *GALLIUM nitride synthesis, *ELECTROMAGNETIC interactions, *ELECTRIC properties of gallium nitride, *IRRADIATION
Abstract

We develop a theory of energy relaxation in semiconductors and insulators highly excited by the long-acting external irradiation. We derive the equation for the non-equilibrium distribution function of excited electrons. The solution for this function breaks up into the sum of two contributions. The low-energy contribution is concentrated in a narrow range near the bottom of the conduction band. It has the typical form of a Fermi distribution with an effective temperature and chemical potential. The effective temperature and chemical potential in this low-energy term are determined by the intensity of carriers' generation, the speed of electron-phonon relaxation, rates of inter-band recombination, and electron capture on the defects. In addition, there is a substantial high-energy correction. This high-energy "tail" largely covers the conduction band. The shape of the high-energy "tail" strongly depends on the rate of electron-phonon relaxation but does not depend on the rates of recombination and trapping. We apply the theory to the calculation of a non-equilibrium distribution of electrons in an irradiated GaN. Probabilities of optical excitations from the valence to conduction band and electron-phonon coupling probabilities in GaN were calculated by the density functional perturbation theory. Our calculation of both parts of distribution function in gallium nitride shows that when the speed of the electron-phonon scattering is comparable with the rate of recombination and trapping then the contribution of the non-Fermi "tail" is comparable with that of the low-energy Fermi-like component. So the high-energy contribution can essentially affect the charge transport in the irradiated and highly doped semiconductors. [ABSTRACT FROM AUTHOR]

Published
2016
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11. The HITRAN2016 molecular spectroscopic database

Author

Gordon, I. E., Rothman, L. S., Hill, C., Kochanov, R. V., Tan, Y., Bernath, P. F., Birk, M., Boudon, V., Campargue, A., Chance, K. V., Drouin, B. J., Flaud, J. -M., Gamache, R. R., Hodges, J. T., Jacquemart, D., Perevalov, V. I., Perrin, A., Shine, K. P., Smith, M. -A. H., Tennyson, J., Toon, G. C., Tran, H., Tyuterev, V. G., Barbe, A., Csaszar, A. G., Devi, V. M., Furtenbacher, T., Harrison, J. J., Hartmann, J. -M., Jolly, A., Johnson, T. J., Karman, T., Kleiner, I., Kyuberis, A. A., Loos, J., Lyulin, O. M., Massie, S. T., Mikhailenko, S. N., Moazzen-Ahmadi, N., Mueller, H. S. P., Naumenko, O. V., Nikitin, A. V., Polyansky, O. L., Rey, M., Rotger, M., Sharpe, S. W., Sung, K., Starikova, E., Tashkun, S. A., Vander Auwera, J., Wagner, G., Wilzewski, J., Wcislo, P., Yu, S., Zak, E. J., Gordon, I. E., Rothman, L. S., Hill, C., Kochanov, R. V., Tan, Y., Bernath, P. F., Birk, M., Boudon, V., Campargue, A., Chance, K. V., Drouin, B. J., Flaud, J. -M., Gamache, R. R., Hodges, J. T., Jacquemart, D., Perevalov, V. I., Perrin, A., Shine, K. P., Smith, M. -A. H., Tennyson, J., Toon, G. C., Tran, H., Tyuterev, V. G., Barbe, A., Csaszar, A. G., Devi, V. M., Furtenbacher, T., Harrison, J. J., Hartmann, J. -M., Jolly, A., Johnson, T. J., Karman, T., Kleiner, I., Kyuberis, A. A., Loos, J., Lyulin, O. M., Massie, S. T., Mikhailenko, S. N., Moazzen-Ahmadi, N., Mueller, H. S. P., Naumenko, O. V., Nikitin, A. V., Polyansky, O. L., Rey, M., Rotger, M., Sharpe, S. W., Sung, K., Starikova, E., Tashkun, S. A., Vander Auwera, J., Wagner, G., Wilzewski, J., Wcislo, P., Yu, S., and Zak, E. J.

Abstract

This paper describes the contents of the 2016 edition of the HITRAN molecular spectroscopic compilation. The new edition replaces the previous HITRAN edition of 2012 and its updates during the intervening years. The HITRAN molecular absorption compilation is composed of five major components: the traditional line-by-line spectroscopic parameters required for high-resolution radiative-transfer codes, infrared absorption cross-sections for molecules not yet amenable to representation in a line-by-line form, collision-induced absorption data, aerosol indices of refraction, and general tables such as partition sums that apply globally to the data. The new HITRAN is greatly extended in terms of accuracy, spectral coverage, additional absorption phenomena, added line-shape formalisms, and validity. Moreover, molecules, isotopologues, and perturbing gases have been added that address the issues of atmospheres beyond the Earth. Of considerable note, experimental IR cross-sections for almost 300 additional molecules important in different areas of atmospheric science have been added to the database. The compilation can be accessed through www.hitran.org. Most of the HITRAN data have now been cast into an underlying relational database structure that offers many advantages over the long-standing sequential text-based structure. The new structure empowers the user in many, ways. It enables the incorporation of an extended set of fundamental parameters per transition, sophisticated line-shape formalisms, easy user-defined output formats, and very convenient searching, filtering, and plotting of data. A powerful application programming interface making use of structured query language (SQL) features for higher-level applications of HITRAN is also provided. Published by Elsevier Ltd.

Published
2017

12. Electron-phonon relaxation and excited electron distribution in gallium nitride

Author

Russian Foundation for Basic Research, Tomsk State University, Ministry of Education and Science of the Russian Federation, Russian Academy of Sciences, Zhukov, Vladlen P., Tyuterev, V. G., Chulkov, Eugene V., Echenique, Pedro M., Russian Foundation for Basic Research, Tomsk State University, Ministry of Education and Science of the Russian Federation, Russian Academy of Sciences, Zhukov, Vladlen P., Tyuterev, V. G., Chulkov, Eugene V., and Echenique, Pedro M.

Abstract

We develop a theory of energy relaxation in semiconductors and insulators highly excited by the long-acting external irradiation. We derive the equation for the non-equilibrium distribution function of excited electrons. The solution for this function breaks up into the sum of two contributions. The low-energy contribution is concentrated in a narrow range near the bottom of the conduction band. It has the typical form of a Fermi distribution with an effective temperature and chemical potential. The effective temperature and chemical potential in this low-energy term are determined by the intensity of carriers' generation, the speed of electron-phonon relaxation, rates of inter-band recombination, and electron capture on the defects. In addition, there is a substantial high-energy correction. This high-energy “tail” largely covers the conduction band. The shape of the high-energy “tail” strongly depends on the rate of electron-phonon relaxation but does not depend on the rates of recombination and trapping. We apply the theory to the calculation of a non-equilibrium distribution of electrons in an irradiated GaN. Probabilities of optical excitations from the valence to conduction band and electron-phonon coupling probabilities in GaN were calculated by the density functional perturbation theory. Our calculation of both parts of distribution function in gallium nitride shows that when the speed of the electron-phonon scattering is comparable with the rate of recombination and trapping then the contribution of the non-Fermi “tail” is comparable with that of the low-energy Fermi-like component. So the high-energy contribution can essentially affect the charge transport in the irradiated and highly doped semiconductors.

Published
2016

14. Ozone spectroscopy in the terahertz range from first high-resolution Synchrotron SOLEIL experiments combined with far-infrared measurements and ab initio intensity calculations.

Author

Tyuterev VG, Barbe A, Manceron L, Grouiez B, Tashkun SA, Burgalat J, and Rotger M

Abstract

Ozone is one of the important molecules in terms of the impact on the atmospheric chemistry, climate changes, bio- and eco-systems and human health. It has a strong absorption in the microwave, terahertz and far-infrared spectral ranges where a large part of the Earth's outgoing longwave radiation to space is located. In this work, the observations, and analyses of the ozone high-resolution spectra in the THz range recorded using the Synchrotron light source of the SOLEIL CNRS equipment are reported for the first time. Thanks to the exceptional brightness of the Synchrotron radiation and to the signal/noise ratio, it was possible to observe many more ozone transitions of the cold rotational band and the hot ν 2 -ν 2 band in the range 0.9-6 THz compared to the previous works. In addition, we have carried out new measurements and assignments for the ν 2 band. The simultaneous fit of the rotational band GS-GS, the hot band ν 2 -ν 2 and the FIR ν 2 band yielded an overall weighted standard deviation of 0.68 for 13,466 line positions within the experimental accuracy. This includes all previously available MW (with the best uncertainty 0.1 - 10 kHz), FIR data and the original SOLEIL measurements that provided experimental accuracy of 0.00005 - 0.0001 cm -1 for the best lines. Significant deviations in new experimental spectra compared to available spectroscopic databases were evidenced, particularly for the line positions and energy levels at high J, K a rotational quantum numbers that are the most pronounced in the 4.5 - 6 THz range. Accurate ab initio calculations of line intensities combined with empirically fitted line positions were used to create new linelists that permit theoretical modelling of the transmittance in a good agreement with the Synchrotron spectra in the entire range of observations for various pressures and optical paths. The region near 100 cm -1 and above appears to be more sensitive to the temperature conditions that should be considered in atmospheric observation for the currently operational and future ground based and space missions., Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2023 Elsevier B.V. All rights reserved.)

Published
2024
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15. Relaxation of highly excited carriers in wide-gap semiconductors.

Author

Tyuterev VG, Zhukov VP, Echenique PM, and Chulkov EV

Abstract

The electron energy relaxation in semiconductors and insulators after high-level external excitation is analysed by a semi-classical approach based on a kinetic equation of the Boltzmann type. We show that the non-equilibrium distributions of electrons and holes have a customary Fermi-like shape with some effective temperature but also possess a high-energy non-Fermian 'tail'. The latter may extend deep into the conduction and valence bands while the Fermi-like component is localized within a small energy range just above the edge of the band gap. The effective temperature, effective chemical potential, and the shape of the high-energy component are governed by the process of electron-phonon interactions as well as by the rates of carrier generation and inter-band radiative recombination.

Published
2015
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